Week 16 Recitation worksheet (final exam review)

CHM 11600 – Recitation – Week 16 – Sp2020 1. The following data were measured for this reaction:   3 3 2 3 2 catalyst H CH COCH Br CH COCH Br + H Br       Experiment [CH 3 COCH 3 ] ( M ) [Br 2 ] ( M ) [H + ] ( M ) Initial Rate (M/s) of disappearance of Br 2 1 0.30 0.050 0.050 5.7 x 10 – 5 2 0.30 0.10 0.050 5.7 x 10 – 5 3 0.30 0.050 0.10 1.2 x 10 – 4 4 0.40 0.050 0.20 3.1 x 10 – 4 5 0.40 0.050 0.050 7.6 x 10 – 5 What is the rate law for the reaction? a) rate = k [CH 3 COCH 3 ] 2 [Br 2 ] 2 [H + ] 2 b) rate = k [CH 3 COCH 3 ] [H + ] 2 c) rate = k [CH 3 COCH 3 ] [Br 2 ] [H + ] d) rate = k [CH 3 COCH 3 ] [H + ] e) Cannot be determined from these data. 2. Consider the following important industrial equilibrium: 2 SO 2 ( g ) + O 2 ( g ) ⇌ 2 SO 3 ( g )  H ° < 0. Which of the following steps will shift the reaction from left to right (toward products)? (i) The removal of SO 3 ( g ). (ii) Decreasing the temperature. (iii) Doubling the reaction pressure. a) Step (i) only b) Step (iii) only c) Steps (i) and (ii) only d) Steps (ii) and (iii) only e) Steps (i), (ii), and (iii) 3. What is the pH of a 0.70 M NH 3 (ammonia) solution? (K b = 1.8 x 10 −5 ) (a) 2.45 (b) 4.90 (c) 9.10 (d) 11.55 (e) 11.79